code: def get_initial_layout(sample_dim=0, base="ABCD"):
      return base[0:sample_dim]
  
imports: from functools import partial
  from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import nvidia.dali.types
  from test_utils import check_batch
  from nose_utils import raises
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: get_initial_layout(sample_dim, base) and returns: base